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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Loss | Amounts related to the changes in accumulated other comprehensive loss were as follows (in thousands):
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Net Unrealized Gain (Loss) on Retirement Plan (2) |  |  | Change in Cumulative Foreign Currency Translation Adjustment |  |  | Total |  |  | Affected Line Items in the Consolidated Statements of Income
Balance December 31, 2020, net of tax |  | $ | 91 |  |  | $ | (36,075 | ) |  | $ | (35 | ) |  | $ | (36,019 | ) |  |
Other comprehensive loss before reclassification |  |  | (58 | ) |  |  | — |  |  |  | (106 | ) |  |  | (164 | ) |  |
Reclassification to net income (1) |  |  | — |  |  |  | 1,174 |  |  |  | — |  |  |  | 1,174 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | (58 | ) |  |  | 1,174 |  |  |  | (106 | ) |  |  | 1,010 |  |  |
Balance March 31, 2021, net of tax |  | $ | 33 |  |  | $ | (34,901 | ) |  | $ | (141 | ) |  | $ | (35,009 | ) |  |
|  | Unrealized Gain (Loss) on Available-for-Sale Securities |  |  | Net Unrealized Gain (Loss) on Retirement Plan (2) |  |  | Change in Cumulative Foreign Currency Translation Adjustment |  |  | Total |  |  | Affected Line Items in the Consolidated Statements of Income
Balance December 31, 2019, net of tax |  | $ | 191 |  |  | $ | (17,167 | ) |  | $ | (21 | ) |  | $ | (16,997 | ) |  |
Other comprehensive gain before reclassification |  |  | 1,855 |  |  |  | — |  |  |  | (33 | ) |  |  | 1,822 |  |  |
Reclassification to net income (1) |  |  | — |  |  |  | 638 |  |  |  | — |  |  |  | 638 |  |  | Selling, general and administrative, research and development and cost of sales
Change during period |  |  | 1,855 |  |  |  | 638 |  |  |  | (33 | ) |  |  | 2,460 |  |  |
Balance March 31, 2020, net of tax |  | $ | 2,046 |  |  | $ | (16,529 | ) |  | $ | (54 | ) |  | $ | (14,537 | ) |  |
(1) | The Company reclassified amortization of prior service cost and actuarial loss for its retirement plan from accumulated other comprehensive loss to net income of $1.2 million and $638,000 for the three months ended March 31, 2021 and 2020.
(2) | Refer to Note 14: Supplemental Executive Retirement Plan.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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